[R] element-by-element comparison

[Uwe Ligges]

On 30.10.2011 04:51, Wendy wrote:
> Hi,
>
> I have a vector and a matrix. For example,
>
> A = [
> 12
> 3
> 4];
>
> B = [
> 4       13
> 10      2
> 4       8];
>
> I am comparing A to each column of B using A>B[,ii], so the expected result
> is
>
> C = [
> 1    0
> 0    1
> 0    0];


This list is about R rather than Matlab dialects.

For R:

A>B

gives logical values and, e.g.,

  apply(A>B, 2, as.integer)

converts to integer.

Uwe Ligges


> I am looking for a way to do this quickly instead of going through the for
> loop, but haven't had any luck yet? Any advice is appreciated.
>
> Thank you very much.
>
> Wendy
>
>
>
>
>
>
> --
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>
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